Fatigue Behavior of A5052 Aluminum Alloy with DLC/Thermally Sprayed WC-12Co Hybrid Coatings

Abstract:

Rotating bending fatigue tests had been performed using A5052 aluminum (Al) alloy with the hybrid coatings which consisted of tungsten carbide including 12% cobalt (WC-12Co) interlayer and diamond-like carbon (DLC) film, in order to investigate the effect of hybrid coating on the fatigue behavior. The WC-12Co layer was thermally sprayed by a high velocity oxygen fuel (HVOF) method on A5052 with the thickness of 70, 120 or 170μm. Subsequently, the DLC film was deposited with the thickness of 15μm. The fatigue strengths of the specimens with WC-12Co single layer were higher than those of the substrate and increased with increasing the thickness of WC-12Co layer. The fatigue strengths of the specimens with the hybrid coating of 70μm WC-12Co interlayer and 15μm DLC film were better than those of the specimen with 70μm WC-12Co single layer. Thus the hybrid coating structure was effective to improve fatigue strengths. However the beneficial effect of hybrid coating was not apparent in the specimens with thicker WC-12Co interlayer of 120 and 170μm.

• Periodical: Advanced Materials Research (Volumes 538-541)
• Pages: 1693-1696
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.538-541.1693
• Online since: June 2012
• Authors: Y. Uematsu, T. Kakiuchi, Y. Kobayashi, Y. Harada
• Keywords: Aluminium Alloy, Diamond-Like Carbon (DLC), Fatigue, Hybrid Coating, Thermal Spray

References

[1] Y. Uematsu, K. Tokaji and H. Takekawa, Fatigue and Fracture of Engineering Materials and Structures, 2010, 33, 607-616.

[2] Y. Uematsu, T. Kakiuchi, T. Teratani, Y. Harada and K. Tokaji, Surface and Coatings Technology, 2011, 205, 2778-2784.

DOI: 10.1016/j.surfcoat.2010.10.040

[3] H. Okada, Y. Uematsu and K. Tokaji, Procedia Engineering, 2010, 2, 283-290.